Methods for the on-line analysis of fluid streams

• US 5,482,862 A
• Filed: 11/10/1994
• Issued: 01/09/1996
• Est. Priority Date: 04/04/1991
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: LaPack, Mark A., Tou, James C., Nestrick, Terry J.
• Primary Examiner(s): Housel, James C.
• Assistant Examiner(s): WALLENHORST, MAUREEN
• Application Number:
  US08/337,125
• Time in Patent Office: 425 Days
• Field of Search: 422/68.1, 422/81, 436/52, 436/54, 436/55, 436/178
• US Class Current: 436/52
• CPC Class Codes: C02F 1/008 Control or steering systems not provided for elsewhere in subclass C02F
• CPC Class Codes: G01N 2035/00465 Separating and mixing arrangements
• CPC Class Codes: G01N 33/1826 organic contamination in water
• CPC Class Codes: G01N 35/1097 characterised by the valves valves in general F16K
• CPC Class Codes: Y10T 436/117497 with a continuously flowing sample or carrier stream
• CPC Class Codes: Y10T 436/119163 with aspirator of claimed structure
• CPC Class Codes: Y10T 436/12 Condition responsive control
• CPC Class Codes: Y10T 436/255 including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

Method for optimizing a treatment for removing organic substances from a chemical process stream wherein known quantities and kinds of organic or other compounds are injected into and dissolved in the stream prior to treatment thereof. Samples of the compounds are extracted from the stream before and after treatment thereof and compared with one another to determine the efficiency of the treatment.

Claims

1. A method of analyzing on-line a stream of liquid flowing to, through, and beyond a treatment zone in which said liquid is subjected to treatment to remove therefrom at least a portion of a compound of interest that is at least partially immiscible with said liquid, said method comprising dispensing a quantity of said compound of interest into said stream so as to uniformly disperse said compound of interest into said stream at a point upstream from said zone;

extracting from said stream downstream from said point and upstream from said zone a first sample of said compound of interest;

treating said stream and the remainder of said compound of interest in said zone;

discharging said stream and any remaining portion of said compound of interest from said zone;

extracting from said stream downstream from said zone a second sample of said compound of interest; and

analyzing the extracted first and second samples to determine the effect of the treatment in said zone on said compound of interest.

2. The method according to claim 1 wherein said compound of interest is at least partially dissolved in said liquid.

3. The method according to claim 1 wherein said compound of interest is dispensed into said liquid at such a velocity as to at least partially dissolve said compound of interest in said liquid.

4. The method according to claim 1 wherein said compound of interest is mixed prior to the dispensing thereof into said stream with a substance that is miscible with said compound of interest and said liquid.

5. The method according to claim 1 wherein said extracted first and second samples are analyzed independently of one another.

6. The method according to claim 1 wherein said compound of interest is a liquid.

7. A method of analyzing on-line a stream of liquid flowing to, through, and beyond a treatment zone in which said liquid is subjected to treatment to affect at least one compound of interest therein that is at least partially immiscible with said liquid, said method comprising dispensing a quantity of said at least one compound of interest into said stream;

forming at a point upstream from said zone a dispersion of said at least one compound of interest in said stream;

extracting from said stream downstream from said point and upstream from said zone a first sample of said at least one compound of interest;

treating said stream and the remainder of said at least one compound of interest in said zone with a reagent capable of affecting said at least one compound of interest;

extracting from said stream downstream from said zone a second sample of said at least one compound of interest; and

analyzing the extracted first and second samples to determine the effect of the treatment in said zone on said at least one compound of interest therein.

8. The method according to claim 7 wherein the quantity of said at least one compound of interest dispensed into said stream is known.

9. The method according to claim 7 wherein the dispersion of said at least one compound of interest in said stream is substantially uniform.

10. The method according to claim 7 wherein said at least one compound of interest is dispensed into said stream continuously.

11. The method according to claim 7 wherein said at least one compound of interest is dispensed into said stream incrementally.

12. The method according to claim 7 wherein said extracted first and second samples are analyzed independently of one another.

13. The method according to claim 7 wherein the rate of flow of said stream through said zone is varied.

14. The method according to claim 7 wherein said at least one compound of interest is dispensed into said stream at a velocity sufficient to effect a substantially uniform dispersion of said at least one compound of interest in said stream.

15. The method according to claim 7 wherein said at least one compound of interest is a liquid.

16. The method according to claim 7 wherein said at least one compound of interest is mixed prior to the dispensing thereof into said stream with a substance that is miscible with said at least one compound of interest and said liquid.

17. The method according to claim 7 wherein said liquid is water.

18. The method according to claim 7 wherein each of said extracted first and second samples consists essentially of said at least one compound of interest.